Oil-Based Drilling Fluid Plugging Method for Strengthening Wellbore Stability of Shale Gas

Table 8

Pollution resistance evaluation results of strong plugging drilling fluid.

System	Condition		AV; (mPa·s)	PV; (mPa·s)	YP; (Pa)	Gel10/Gel10; (Pa/Pa)	FLAPI; (mL)
Formula CN-5	NaCl resistance	Before aging	67.5	53	14.5	8.18/15.33	0.2
		125°C/16 h	77.5	59	18.5	3.58/25.55	0.2
	CaCl2 resistance	Before aging	69	54	15	7.67/14.31	0.2
		125°C/16 h	80	65	15	3.58/22.98	0
	Poor clay resistance	Before aging	67.5	52	15.5	8.18/15.33	0
		125°C/16 h	73	58	15	7.15/18.40	0